USGS InfoBank program -- showpoints

Subroutine to display all non-deleted points in the current time window with
an 'x'.

COMMENTS

This subroutine is called by and is internal to GRAPHED.

TO_USE

call showpoints (time, data, ldeleted, icount, istart, startime, timespan)
Input:
time - array of time in real tenths of a second from the input file
data - array of data from the input file
ldeleted - array of flags indicating whether an array element has been
deleted
icount - number of items in the arrays
istart - pointer to the first array element in the current time window
startime - starting time for current window in tenths of a second
timespan - width of the x axis in real tenths of a second